Question 557743
For the expression to be undefined, it is necessary for the denominator be equal to zero.
{{{9/(5x+1)}}} Set the denominator equal to zero and solve for x.
{{{5x+1 = 0}}} Subtract 1 from both sides.
{{{5x = -1}}} Divide by 5.
{{{x = -1/5}}}
For {{{x = -1/5}}} the expression is undefined.
{{{9/(5x+1)}}} Substitute {{{x = -1/5}}}
{{{9/(5(-1/5)+1) = 9/(-1+1)}}}={{{9/0}}} Undefined!